Valve



May 19, 1942. w. R. TUCKER VALVE Original Filed Oct. 4, 193'? 5 Sheets-Sheet l May 19, 1942. w. R'. TUCKER VALVE original Filed oct. 4,l 1937 s sheets-sheet 2 Jrvuamv WARREN R. TUCKER,

May 19, 1942. w. R. TUCKER 7 2,283,397

VALVE original Filed oct. 4, 1937 s sheets-Sheet 5 I M. m WARREN R. KER,

mauve motor and the in Figure 3, showing the stops PatentedMay 19,-1942 "accesar 'VALVE Wan-en B. Tucker, Mount Gilead, Ohio, vassignor AThe Hydraulic Development Corp.

Inc.,

Wilmington, Del.,acorporatlon of Delaware Original application October 4, 1937,. Serial No.

Divided am! this 22; 1938. Serial N0. 226,099'

,l `o lllication August 1 claim. A-(c1. 121-465) Y member attached to the motor, and having stops 'I'his invention relates to hydraulic-machine control circuits, and in particular, to such cirby electrical circuits.

One object of this invention is to provide an arrangement for the electrical control of' a' hycuits controlled by valves which are regulated draulic machine by means of a motor-actuated valve for directing the ilow of pressure uid to the machine. Y

Anotherobject is to provide a motor-operated valve forregulating .the distribution of pressure fluid to a hydraulic circuit, this valve rhaving a valve member which is rotatable through`a partial revolution to dierently distribute the pressure iluid.

Another object is to provide a motor-operated valve unit, wherein 'a reversible high-torque low`- current motor adapted for continuous stalled service; serves when vopp'ositely energized, to rotate a valve member through a partial revo- I lution in opposite directions, thereby -diilerently distributing the flow of uid through the valve. 'I'his application is a division of my application l Serial No. 167,184, led October 4, 1937. 11n the drawings: y

Figure 1 is a circuit diagram showing diagrammatically the hydraulic machine )and draulic circuit of 'this invention; Figure 21s 'a wiring diagrainof the circuit for energizing the motor which shifts the pilot valve the hyvin Figure'l;` I ,v A

Figure 3 isa side elevation, partlyin centrall vertical section, showing the valve-actuating thereto;

Figure 4 is a cross section along the line 3 4 v for limiting the opposite means of the valve;

Figure 5 is a central vertical section through the pilot valve attached to the lower end of the motor in Figure 3; and

Figure 6 is a cross vsection along the line 6- in Figure 5.

General arrangement attachment'of the pilot valvehydraunc circuit.

- the motor I5 'being bolted to` associated therewithl to limit the rotation of the valve member to a partial revolution. 'This circuit and valve have been found vespecially valuable in connection with the'control Vof hy- .draulic presses, and in particular, plastic in- Jection molding presses.

The motor-operated valve of the prese' 1t invention in such machines, has been found toprovide a smooth and-.quiet performance which is decidedly superior to the irregular and "noisy solenoidal devices hitherto employed. Referring to the drawings in detail, Figure 1 shows thehydraulic circuit of this invention as consisting of a hydraulic pump I0, arranged to -distributezfluidto a motor-actuated pilot lvalve II, which in turn, regulates themotions oi a four-way main control valve I2, the latter distributing pressure iiuid from thepumpA I0 in reversible directions to the hydraulic-motor I3.- A tank I4 supplies iiuid for the operation of the Pilot valve construction The motor-actlated pilot valve II Which'controls the distrib shifting the main control valve I2 -to its'opposlte positions, includes a reversible electric motor I5, which is preferably ofa high-torque' low-current type suitable for continuous stalled service. The motor I5 has a motor shaft I 6, brought out at opposite ends of the motor. Secured, as at IBa,

on the upper end of the' motor shaft I6, 'is a The shaftl manual valve-operating handle IJ'I. I6 passes through a plate I8 secured, as at I 3, to the upper surface of the motor supportl 20,

thereof, as at 2| (Figure 3).

Mounted upon the lower side ofthe motor I5 and bolted thereto, as at 22, lis the spacing sleeve 23 having' an arcuate projection 24 (Figure 4) forming a lug of a partial circumference. Coacting with this fixed arcuate lug 24 is a movable In general, the electrically-controlled circuit l of 'this invention consists of a reversible motor' connected to rotate a pilot valve member, whichv in turn,- regulates the distribution of pressure fluid to a servo-circuit adapted to shift a four-- way main control valve so as to regulate the distribution of pressure fluid from a pump to the hydraulic machine in a reversible manner The valve-actuating motor'is controlled byanelectrical circuit which is arranged to energize the motor oppositely so as to shift the pilot valve in opposite directions, this shifting being brought l,

about by the operation of switch means actuated manually orv automatically. rihe motoractuated valve consists of a rotatable valve arcuate lug 25 upon a sleeve 26, which isl keyed 'as at 21 to the lower end of the motor shaft IB.v

Secured within the`4 sleeve k26', as by the pin 23,

is the pilot valverod 29 of the pilot valve II."

The latter is provided with a supporting plate 3|), which issecured to the spacing sleeve 2 3 andthe motor I5 by the samebolts 22. 'Se-- cured to the supporting plate 30, as by the screws 3I, are a spacer andpacking retainer 32-anda valve casing 33. The valve rod 29 passes through bores 34 and 35 in the supporting plate30 .and v spacer 32, respectively, leakage therearound be'- Ying prevented by a packing 36 within an annular seat3'l. y

fMounted on the lower end of the. valve rod 23 and integral therewith is the vvalve member -38 of plug-shapedform. This'- valve member 38 is ion of the pressure uid for.

' in the opposite direction,

nular cut-away portion or passageway 39 theresitesides of the main piston head 11, forming a 4 Part of the main plunger'18.

around, and with cross passages 40 and 4| therethrough (Figure 6). The valve member 38 rotates within a valve bore 42, thevlower end ot which is provided with a central recess 43 communicating through an exhaust passageway 44 with an exhaust port 45. 'Ihe longitudinal pas- The pilot valve I I is connected to the servocylinder chambers 65 and 66 by means oi! the lines 19 and 80. The line 19 runs from the service outlet- 48 to the port 8| of the servocylinder chamber 61, whereas the line 80 runs from the service outlet port 49 to the port 82 sageway 46 connects the-top of the valve plug to the exhaust passageway 44 in order to equalize the pressure upon the top and bottom of the valve member 88. The annular passageway 89, on the other hand, equalizes the pressure on the opposite sides of the valve member '38. Thevalve4 casing 33 is provided with, an inlet port 41 anda pair of service f to which connection is made to the pump I and four-way main control valve |2, respectively. The valve member 38 also has flat side portions 38a.

If the motor i is energized to rotate the valve member 38 so that the passage 4I communicates with the service outlet 48 (the arcuate lugs 25 outlet ports 48 and 49,'

and 24 cooperating to preventa further rotation) then pressure fluid is admitted from the pump l0, through the inlet 41, to the valve bore 42, and passes outward through the service outlet `49. Simultaneously the service outlet 48 will be connected to the central passageway 50 leading downwardly to the exhaust passageway 44 and exhaust port 45. If the motor I5 is reversely energized so that A'the valve member 38 is rotated the arcuate lugs 24 and again cooperate to halt the valve member 38 in such a position that the passage 40 communicates with the service outlet 49. Under these circumstances, pressure fluid is` admitted from the pump I0, through the inlet 41, to the valve bore 42, and passes outward through the service outlet 48. The service outlet 49 is thus connected to the exhaust port by way of 'the cross passage 40, the central passageway 50 and the exhaust 'passageway 44.

Hydraulic circuit The hydraulic circuit which the pilot valve `controls is shown in Figure ll, and has already been described with regard to its general elements. The pump I0 is connected to the tank I4 by means of the suction line 5|, the pressure line 52 running therefrom to the pressure inlet port 53 of the main control valve I2. The latter is provided with a casing 54 having exhaust ports 55 and 56 communicating vwith the valve bore 51, at the ends thereof, and likewise having service ports 5,8 and 59 located at intermediate points therealong.

Movable to and fro within the valve bore 61 is a valve rod having-spaced heads 6I and 62, by which the distribution ofthe iluid is controlled from the inlet port 53 selectively to either ofthe service ports 58 or 59. The valve rod 60 passes through plugs 63 and 64, into end casings 65 and 66 forming servo-cylinders and having chambers 61 and 68 respectively. The right-- hand end 69 terminates within the chamber 61 and theleft-end 10 terminates within the chamheads for shifting the -valve rod 60 and valve heads 6| and 62. The exhaust ports 55 and 56 are connected to the line 1| leading to the tank a I4, whereas the'service ports 58 and 59 are connected by the lines 12 and 13 to the opposite ends of the cylinder bore or chamber' 14 of the hydraulic motor I3 at the ports 15 and 16 on oppober 68 so as to provide, in eil'ect, servo-piston 4f of the servo-cylinder .chamber 68. From the exhaust port 45 of the pilot valve II the line 83 runs to join the exhaust line 1| leading back lto the tank I4. Fromthepump pressure line 52 the pilot fliud supply line 84 runs to the inlet port 41A`of the pilot valve II. The main control valve I2 is so connected to the pilot valve I and pump I0 that when pressure fluid is admitted to either of the servo-cylinder chambers 61 or 68, thev valve rod 60 and piston heads 6| and 62 are shifted toward the opposite end of the valve I2, thereby connecting one of the ports 58 or |i9 to the inlet port 53, and connecting the other port to one of the exhaust ports 55 or 56, depending upon the position of the piston heads 6| and 62.

Electrical control circuit In the electrical control circuit (Figure 2) the three-phase power mains 85, 86 and 81 are connected through the line switch 88 to the power lines 89, 90 and 9|, which serve to provide power current for the energization of the pilot valveactuating motor I5.

The electrical circuit shown in Figure 2 contains a two-pole switch 92 and a single pole reversing switch 93; also a ve-pole magnetic contactor 94 and a four-pole magnetic contactor`95. The two-pole switch 92 has `an upper normally open switch bar 96 and a lower normally closed switch bar 91.. The reversing switch 93 has a single normally closed switch bar 98. The iivepole contactor 94 is provided with an operating coil 99 and ve switch bars |00, |0|, |02, |03 and |04, the switch bar I00`being normally closed and the others normally open. The four-pole contactor 95 is provided with an operating coil |05 and switch blades |06, |01, |08 and |09. The switch blade |06 is normally closed and the other switch blades normally open. Either the two-pole switch 92 or the reversing switch 93 may be operated manually or mechanically by 'direct action or by time delay mechanism, or by pressure-responsive mechanism, as desired, and as most suitable for the particular installation. This invention contemplates the use of any one or a combination of these switchactuating arrangements. For purposes of simplicity, however, the switches 92 and 93 of Figure 2 are illustrated as being manually operated.v

` Operation A The operation of the individual velements of thex hydraulic circuit and of the pilot valve has been described in connection with those elements. .In the operation ofzthe electric and hydrauhc circuits (Figures l and 2), let it be assumed that `the 'lineswitch 88 is open, thereby deenergizing the power lines 89, and 9|. The switches and contractors 92, 93, 94 and 95 assume the positions shown in Figure 2, under such cons and the switch blades mz, los and los to the per switch blade I99 of the contactor 99 and the 5 operating coil I 95 of the contactor 95, back to the power line 89. The switch' blades oi the contactor 95 immediately shift so that the blade |99 is opened and the blades I91., |98 and |99 closed.

The motor I is then connected to the power 19 lines 89, 99 and 9i 4through its lines II9, III -and IIZ leading from the motorv terminals II3, II4 and I I5, respectively. The opening of the switch blade |96 opens the circuit containing the operating coil 99 of the magnetic contacter 99. and l5 prevents its energization. The energization of the motor I5 causes itto rotate its 'shaft I6,

Y whereby shifting the valve member 39 of the pilot valve II into its extreme position in one direction. The arcuate stops 29 and 25 (Figure 3) co- 20 operate to halt the valve in this position'.

Under these circumstances the pump I9 takes in uid through the suction line 5I, and discharges its pressure fluid through the pressure line 52, the pilot pressure line 84 and the inlet Q5 port 4l of the pilot valve II, into the pilot valve chamber 42, whence it passes through the service outlet port 98, along the line 19 and through the port 8l, into the lright-,hand servo-cylinder chamber $1. 'Ihe pressure iiuid acts against the .30

right-hand end 69 of the v-alve rod .69 and shifts the latter to its extreme left-hand position.r The valve heads 6I and 92 thereby assume the positions of Figure l, and permit pressure fluid to pass from the pump I9, along the line 52, through vthe port 53 andfvalve bore 51, out the port 59 and along the line 13, into the return side of the hydraulic cylinder bore 14 by way of the port 16. The pressure fluid acts against the main piston head 11 and forces the main plunger to its left- 40 hand position. The iiuid displaced from the forward side of the main cylinder bore 19 is dis charged through the port 15, the line 12, the port 58, the valve bore 51, the port 55 and the exhaust line 1 I, into the tank I4.

. 4 The operator now moves the switch 92 so as to close the switch blade 96 and open the switch bl-ade 91, thereby breaking the energizing circuit through the operating coil l95 of the magnetic contactor 95. The switch blades 91, E99 and |99 50 thereof open while the switch blade I96 closes, in response to this deenergization. Current now passes vfrom the power line 9I, through the oprating coil 99 of the magnetic contactor 99, thence through the normally closed switch blade I96 of 55 the magnetic contactor 95, and through the nori mally open but now closed upper switch blade 96 of the switch 92, and the normally closed switch blade 98 of the reversing switch 99, back to the power line 89. This action energizes the operating coil 99 of the contacter 99, thereby closing the switch blades I9I, I92, |93 and 19d, and open-n ing the switch blade E99. The switch 99 may then be released and permitted to return to its normal position without breaking the energize,- tion circuit of the contactor coil 99 because a holding circuit therefor is made through the switch blade' I9i bridging around the normally open upper switch blade 96 of the two-pole switch 92.

With the magnetic contactor 9d thus energized. 7o

the terminals H9. Hd and H9 of the motor i9 are connected through the lines IISJW. and H9,

`ure 1.

power lines 9i, 99 and-,89, respectively.v This reversal of connections of the motor I5 reverses its energization and causes it to move the valve member 99 of the pilot` valve'II in the opposite direction until` the cooperating lugs 24 and 25 again halt the valve member 38 in its opposite extreme position.

When this occurs the ow of pressure fluid from the pilot valve inlet port 41' proceeds through `the service outlet port 49, along the line 99 to the left-hand servo-cylinder chamber 68, where it acts against the valve rod end I9 'and shifts the heads 6I and B2 to their extreme right-hand positions from those shown in Fig- 15 and 16 kof the hydraulic motor I3 are then reversed so that pressure iiuid enters the port 15 and fluid is discharged from the port'16. The piston head 11 and the main plunger 19 are then forcedto the right. The motionof the main plunger 19 is reversed at any moment by opening the reversing switch 93, whereupon the energlzation of the operating coil 99 of the magf netic contactor 94 is broken, thereby opening its switch blades I9I, |92, |93 and I99, and closing its switch blade |99. This again energizesa circuit through the magnetic contactor operating coil |95 of the contactor 95, thereby energizing the valve-actuating motor I5 inthe reverse direction, and causing a reversal in the` hydraulic circuit and a consequent return movei ment of the main plunger 'I8 to its left-handbosition shown in Figure l. Thus, regardless of the` position of the piston head 11, the direction of its movement may be reversed at any time by manipulating the vswitches 92 or 93, as the case cross passages communicating with each other' and adjacent laterally disposed .cutaway portions connected with each other toform a balanced valve but not communicating with said cross passages, said valve member also having an axial exhaust passageway therethrough constantly communicating with said cross passages andiexhaust port, a. longitudinal passageway connecting the stem end of the valve to the exhaust passageway for equalizing pressure upon the stem end and opposite end of the valve member, said rotary valve member being operable to open communication between said inlet port and one of said service ports through a cutaway portion while establishing communication between said exhaust port and the other service port through the exhaust passage, an electric stall motor having its motor shaft rigidly connected to said motor valve member for selectively moving said valve member in one or the other direction, and means for limiting the rotation of said rotary valve member to a partial revolution in its op- Positc directions of motion.

WARREN R TUCKER.

The hydraulic connections of the ports 

